DJ, what that range shows is that a bag rated without showing the full EN range could be almost useless at its claimed rating. I saw comments on a Wal-Mart bag rated at 20F in which users claimed it didn't keep them warm at 50F, but then again they only paid about $20 for it, so I wonder what they expected.

Steadman - I think you mean the lab at Natick - here is the link.
http://nsrdec.natick.army.mil/about/index.htm
This link goes to a page about the military sleeping bag system. Note that the contractor for the pad is Cascade Designs, which is Therm-a-Rest
https://peosoldier.army.mil/portfolio/index.asp?id=6f5ad3a8&pagenumber=94
The next page shows the system; scroll through this portfolio to see your tax dollars at work. It has pictures of just about everything a soldier uses, from base layers, to helmets, guns, pack, sunglasses, all kinds of stuff.